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 A203264 Permanent of the n-th principal submatrix of (A134446 in square format). 1
 1, 4, 72, 2304, 172800, 18662400, 3657830400, 936404582400, 379243855872000, 189621927936000000, 137665519681536000000, 118943009004847104000000, 140709579652734124032000000, 193053543283551218171904000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..14. MATHEMATICA f[i_, j_] := Floor[(i + 1/2)] Floor[(j + 1)/2]; m[n_] := Table[f[i, j], {i, 1, n}, {j, 1, n}] TableForm[m[8]] (* 8x8 principal submatrix *) Flatten[Table[f[i, n + 1 - i], {n, 1, 12}, {i, 1, n}]] (* A134446 as a square *) Permanent[m_] := With[{a = Array[x, Length[m]]}, Coefficient[Times @@ (m.a), Times @@ a]]; Table[Permanent[m[n]], {n, 1, 14}] (* A203264 *) CROSSREFS Cf. A134446. Sequence in context: A304316 A186415 A211038 * A295383 A309980 A266865 Adjacent sequences: A203261 A203262 A203263 * A203265 A203266 A203267 KEYWORD nonn AUTHOR Clark Kimberling, Jan 14 2012 STATUS approved

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Last modified September 9 04:58 EDT 2024. Contains 375759 sequences. (Running on oeis4.)